TDA7407 datasheet(14/46 Pages) STMICROELECTRONICS

14 / 46 page

Stereo decoder part

TDA7407

14/46

Stereo decoder part

Table 6.

Stereo decoder electrical characteristics

(VS = 9V; de-emphasis time constant = 50μs,VMPX = 500mV (75KHz deviation),

fm= 1KHz, Gv = 6dB. Tamb = 25°C; unless otherwise specified)

Symbol

Parameter

Test condition

Min.

Typ.

Max.

Unit

Vin

MPX input level

Gv = 3.5dB

0.5

1.25

VRMS

Rin

Input resistance

100

130

GMIN

Min. input gain

1.5

3.5

4.5

GMAX

Max. input gain

8.5

12.5

GSTEP

Step resolution

1.75

2.5

3.25

SVRR

Supply voltage ripple

rejection

Vripple = 100mV; f = 1KHz

Max. channel separation

THD

Total harmonic distortion

0.02

0.3

Signal plus noise to noise

ratio

A-weighted, S = 2VRMS

Mono / stereo switch

VPTHST1 Pilot threshold voltage

for Stereo, PTH = 1

VPTHST0 Pilot threshold voltage

for Stereo, PTH = 0

VPTHMO1 Pilot threshold voltage

for Mono, PTH = 1

VPTHMO0 Pilot threshold voltage

for Mono, PTH = 1

PLL

Δf/f

Capture range

0.5

De-emphasis and highcut

tHC50

De-emphasis time constant

Bit 7, Subadr, 10 = 0,

VLEVEL >> VHCH

μs

tHC75

De-emphasis time constant

Bit 7, Subadr, 10 = 1,

VLEVEL >> VHCH

100

μs

tHC50

Highcut time constant

Bit 7, Subadr, 10 = 0,

VLEVEL >> VHCL

100

150

200

μs

tHC75

Highcut time constant

Bit 7, Subadr, 10 = 1,

VLEVEL >> VHCL

150

225

300

μs

Stereo blend and highcut control

REF5V

Internal reference voltage

4.7

5.3

TCREF5V Temperature coefficient

3300

ppm

LGmin

Min. LEVEL gain

-1

LGmax

Max. LEVEL gain

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